Network connections should therefore be protected, at a level based on the risk. The assumption must be that the connecting parties are to a certain degree hostile and have to be strictly constrained to the access for which the connection was agreed. The connecting parties will, after all, have their own security policies and risk management philosophies, and these may vary considerably. Each security management domain will need to apply stringent logical access controls, and should strongly consider using firewalls and related technologies to defend their 'perimeter'
